I would say that the three main characters in Shirley Jackson's "The Lottery" are Old Man Warner, Tessie Hutchinson, and Mr. Summers.
I'm not 100% clear on what you mean by "perspective." The story itself is written in the third person perspective, so nothing changes there between the three characters. I think that you might mean their "perspective" (opinion) on the process of the lottery.
Among the three main characters, their attitude toward the lottery varies quite a bit. Tessie Hutchinson is not in favor of the lottery. In fact, she thinks that this particular year's lottery wasn't fair because her husband wasn't there to draw a paper.
"It isn't fair, it isn't right," Mrs. Hutchinson screamed, and then they were upon her."
That's the last line of the story, but Mrs. Hutchinson says the "it wasn't fair" line 4 other times. She repeats it like a mantra.
On the complete opposite end of the spectrum is Old Man Warner. He sees no problems with the lottery. In fact, he sees it as a good thing. When he is told that other towns have stopped the lottery or are considering stopping it, he dismisses those ideas as ridiculous.
"Some places have already quit lotteries." Mrs. Adams said. "Nothing but trouble in that," Old Man Warner said stoutly. "Pack of young fools."
Mr. Summers's perspective exists in between the opinions of Old Man Warner and Mrs. Hutchinson. I would say that Mr. Summers is ambivalent toward the proceedings. He is in charge of the drawing. His name isn't in the mix. He exists simply to make sure that the event runs smoothly and enforce the rules.